ramus: A nerve bundle containing the myelinated preganglionic axons of\rsympathetic motor neurons en route to the sympathetic chain or to a collateral ganglion.\r(13)\rWormian bones: See sutural bones..\rX\rxiphoid process: The slender, inferior extension of the sternum. (7)\rY\rY chromosome: The sex chromosome whose presence indicates that the individual is a\rgenetic male. (29)\rZ\rzona fasciculata: f the adrenal cortex that secretes glucocorticoids. (18)\rzona glomerulosa: The region of the adrenal cortex that secretes mineralocorticoids. (18)\rzona reticularis: The region of the adrenal cortex that secretes androgens. (18)\rzygote: The fertilized ovum, prior to the start of cleavage. (28)
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